<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>将缓冲内容输出到文件</title>

 </head>
 <body><div class="manualnavbar" style="text-align: center;">
 <div class="prev" style="text-align: left; float: left;"><a href="function.feof.html">feof</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="function.fgetc.html">fgetc</a></div>
 <div class="up"><a href="ref.filesystem.html">Filesystem 函数</a></div>
 <div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.fflush" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">fflush</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.1, PHP 5)</p><p class="refpurpose"><span class="refname">fflush</span> &mdash; <span class="dc-title">将缓冲内容输出到文件</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.fflush-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>fflush</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
   )</div>

  <p class="para rdfs-comment">
   本函数强制将所有缓冲的输出写入
   <em><code class="parameter">handle</code></em> 文件句柄所指向的资源。
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
  <p class="para">文件指针必须是有效的，必须指向由
<span class="function"><a href="function.fopen.html" class="function">fopen()</a></span> 或 <span class="function"><a href="function.fsockopen.html" class="function">fsockopen()</a></span> 成功打开的文件(并还未由 <span class="function"><a href="function.fclose.html" class="function">fclose()</a></span> 关闭)。</p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.fflush-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">handle</code></em></dt>

     <dd>

      <p class="para">文件指针必须是有效的，必须指向由
<span class="function"><a href="function.fopen.html" class="function">fopen()</a></span> 或 <span class="function"><a href="function.fsockopen.html" class="function">fsockopen()</a></span> 成功打开的文件(并还未由 <span class="function"><a href="function.fclose.html" class="function">fclose()</a></span> 关闭)。</p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.fflush-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.fflush-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2294">
    <p><strong>Example #1 File write example using <span class="function"><strong>fflush()</strong></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$filename&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'bar.txt'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'r+'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">rewind</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'Foo'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fflush</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">ftruncate</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">ftell</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 
 <div class="refsect1 seealso" id="refsect1-function.fflush-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.clearstatcache.html" class="function" rel="rdfs-seeAlso">clearstatcache()</a> - 清除文件状态缓存</span></li>
    <li class="member"><span class="function"><a href="function.fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a> - 写入文件（可安全用于二进制文件）</span></li>
   </ul>
  </p>
 </div>

</div><hr /><div class="manualnavbar" style="text-align: center;">
 <div class="prev" style="text-align: left; float: left;"><a href="function.feof.html">feof</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="function.fgetc.html">fgetc</a></div>
 <div class="up"><a href="ref.filesystem.html">Filesystem 函数</a></div>
 <div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
